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hwmon: (pmbus/ltc2978) Add support for LTC3880 to LTC2978 driver

Telusuri Sumber 
The LTC3880 PMBus command set is comparable to LTC2978. Add support for it
to the LTC2978 driver.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
This commit is contained in:
Guenter Roeck
2011-09-11 20:31:09 -07:00
orang tua c3ff9a674c
melakukan ddfb41ca2a
3 mengubah file dengan 168 tambahan dan 30 penghapusan
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137
drivers/hwmon/pmbus/ltc2978.c
Melihat File

@@ -1,5 +1,5 @@
/*
* Hardware monitoring driver for LTC2978
* Hardware monitoring driver for LTC2978 and LTC3880
*
* Copyright (c) 2011 Ericsson AB.
*
@@ -26,19 +26,28 @@
#include <linux/i2c.h>
#include "pmbus.h"
enum chips { ltc2978 };
enum chips { ltc2978, ltc3880 };
/* LTC2978 and LTC3880 */
#define LTC2978_MFR_VOUT_PEAK 0xdd
#define LTC2978_MFR_VIN_PEAK 0xde
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
#define LTC2978_MFR_SPECIAL_ID 0xe7
/* LTC2978 only */
#define LTC2978_MFR_VOUT_MIN 0xfb
#define LTC2978_MFR_VIN_MIN 0xfc
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
/* LTC3880 only */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
#define LTC2978_ID_REV1 0x0121
#define LTC2978_ID_REV2 0x0122
#define LTC3880_ID 0x4000
#define LTC3880_ID_MASK 0xff00
/*
* LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
@@ -52,6 +61,8 @@ struct ltc2978_data {
int vin_min, vin_max;
int temp_min, temp_max;
int vout_min[8], vout_max[8];
int iout_max[2];
int temp2_max[2];
struct pmbus_driver_info info;
};
@@ -70,7 +81,8 @@ static inline int lin11_to_val(int data)
return (e < 0 ? m >> -e : m << e);
}
static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct ltc2978_data *data = to_ltc2978_data(info);
@@ -106,6 +118,25 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
ret = data->temp_max;
}
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_VIN_HISTORY:
case PMBUS_VIRT_RESET_TEMP_HISTORY:
ret = 0;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct ltc2978_data *data = to_ltc2978_data(info);
int ret;
switch (reg) {
case PMBUS_VIRT_READ_VIN_MIN:
ret = pmbus_read_word_data(client, page, LTC2978_MFR_VIN_MIN);
if (ret >= 0) {
@@ -140,18 +171,74 @@ static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
ret = data->temp_min;
}
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
case PMBUS_VIRT_RESET_VIN_HISTORY:
case PMBUS_VIRT_RESET_TEMP_HISTORY:
case PMBUS_VIRT_READ_IOUT_MAX:
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_READ_TEMP2_MAX:
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
ret = -ENXIO;
break;
default:
ret = ltc2978_read_word_data_common(client, page, reg);
break;
}
return ret;
}
static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct ltc2978_data *data = to_ltc2978_data(info);
int ret;
switch (reg) {
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, page, LTC3880_MFR_IOUT_PEAK);
if (ret >= 0) {
if (lin11_to_val(ret)
> lin11_to_val(data->iout_max[page]))
data->iout_max[page] = ret;
ret = data->iout_max[page];
}
break;
case PMBUS_VIRT_READ_TEMP2_MAX:
ret = pmbus_read_word_data(client, page,
LTC3880_MFR_TEMPERATURE2_PEAK);
if (ret >= 0) {
if (lin11_to_val(ret)
> lin11_to_val(data->temp2_max[page]))
data->temp2_max[page] = ret;
ret = data->temp2_max[page];
}
break;
case PMBUS_VIRT_READ_VIN_MIN:
case PMBUS_VIRT_READ_VOUT_MIN:
case PMBUS_VIRT_READ_TEMP_MIN:
ret = -ENXIO;
break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
ret = 0;
break;
default:
ret = -ENODATA;
ret = ltc2978_read_word_data_common(client, page, reg);
break;
}
return ret;
}
static int ltc2978_clear_peaks(struct i2c_client *client, int page,
enum chips id)
{
int ret;
if (id == ltc2978)
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
else
ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
return ret;
}
static int ltc2978_write_word_data(struct i2c_client *client, int page,
int reg, u16 word)
{
@@ -160,20 +247,28 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
int ret;
switch (reg) {
case PMBUS_VIRT_RESET_IOUT_HISTORY:
data->iout_max[page] = 0x7fff;
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
data->temp2_max[page] = 0x7fff;
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_VOUT_HISTORY:
data->vout_min[page] = 0xffff;
data->vout_max[page] = 0;
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_VIN_HISTORY:
data->vin_min = 0x7bff;
data->vin_max = 0;
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
ret = ltc2978_clear_peaks(client, page, data->id);
break;
case PMBUS_VIRT_RESET_TEMP_HISTORY:
data->temp_min = 0x7bff;
data->temp_max = 0x7fff;
ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
ret = ltc2978_clear_peaks(client, page, data->id);
break;
default:
ret = -ENODATA;
@@ -184,6 +279,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page,
static const struct i2c_device_id ltc2978_id[] = {
{"ltc2978", ltc2978},
{"ltc3880", ltc3880},
{}
};
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
@@ -211,6 +307,8 @@ static int ltc2978_probe(struct i2c_client *client,
if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2) {
data->id = ltc2978;
} else if ((chip_id & LTC3880_ID_MASK) == LTC3880_ID) {
data->id = ltc3880;
} else {
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
ret = -ENODEV;
@@ -223,7 +321,6 @@ static int ltc2978_probe(struct i2c_client *client,
ltc2978_id[data->id].name);
info = &data->info;
info->read_word_data = ltc2978_read_word_data;
info->write_word_data = ltc2978_write_word_data;
data->vout_min[0] = 0xffff;
@@ -233,6 +330,7 @@ static int ltc2978_probe(struct i2c_client *client,
switch (id->driver_data) {
case ltc2978:
info->read_word_data = ltc2978_read_word_data;
info->pages = 8;
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
@@ -243,6 +341,21 @@ static int ltc2978_probe(struct i2c_client *client,
data->vout_min[i] = 0xffff;
}
break;
case ltc3880:
info->read_word_data = ltc3880_read_word_data;
info->pages = 2;
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
| PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
data->vout_min[1] = 0xffff;
break;
default:
ret = -ENODEV;
goto err_mem;
@@ -289,7 +402,7 @@ static void __exit ltc2978_exit(void)
}
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LTC2978");
MODULE_DESCRIPTION("PMBus driver for LTC2978 and LTC3880");
MODULE_LICENSE("GPL");
module_init(ltc2978_init);
module_exit(ltc2978_exit);